The iPhone features a built in calculator application that allows you to perform basic scientific calculations. Using the calculator application's scientific mode you can calculate cubed roots. A cubed root is a number that when multiplied by itself three times yields a given number. For example, the cubed root of 8 is 2 since 2 x 2 x 2 = 8.

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Tap the "Calculator" application on your iPhone.

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Rotate your iPhone to the horizontal or landscape position to activate the scientific features of the Calculator application.

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Enter the number you want to find the cubed root of. For example, tap "8" to find the cubed root of 8.

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Press the root key. You will find the root key in the third row, the third icon from the left.

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Tap the "3" key to display the cubed root. Continuing the same example, the iPhone's Calculator application will display a "2."